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Water Quality - refers to anything that might affect the invertebrates living in the river <br />for part of their life cycle (such as nutrients, oxygen, sediment, organic pollution, toxins, <br />stream flow, and quality of habitat). <br />3.2 Hilsenhoff Family Level Biotic Index <br />The family level biotic index (FBI) for a site is the weighted average of the biotic indexes <br />for all of the invertebrates in the sample. The FBI summarizes the various pollution <br />tolerance values of all families in a sample. The FBI score for a particular monitoring site <br />corresponds to a likely degree of organic pollution present at that location. As such, the <br />FBI score is a useful tool for evaluating the general status of organic pollution in streams <br />within a watershed. <br />Evaluation of water quality using Hilsenhoff s Family Level Biotic Index <br />Family Biotic Index <br />Stream Health <br />Degree of Organic Pollution <br />0.00 -3.75 <br />Excellent <br />Organic pollution unlikely <br />3.76 -4.25 <br />Very good <br />Possible slight organic pollution <br />4.26 -5.00 <br />Good <br />Some organic pollution probable <br />5.01 -5.75 <br />Fair <br />Fairly substantial pollution likely <br />5.76 -6.50 <br />Fairly poor <br />Substantial pollution likely <br />6.51 -7.25 <br />Poor <br />Very substantial pollution likely <br />7.26 -10.0 <br />Very poor <br />Severe organic pollution likely <br />ource: ttusennotr, <br />• <br />• <br />